By Kim RahnStudents at Dongduk Women's University have been enraged after a man posted video clips of himself wandering around the campus, naked, and masturbating in a classroom.Police are investigating the case and trying to identify the man after a complaint from the student council.The case was made public Saturday after a student filed an online petition on Cheong Wa Dae's website, calling on the government to guarantee women's right to safety.According to the petition, a man posted photos and video clips on Twitter, Oct. 6, in which he was wandering around empty classrooms and corridors of a building of the women's university in the daytime naked. In one clip, he masturbated on a classroom desk."As a student at Dongduk, the incident is so horrible, and as a student who takes lectures in the very classroom where he masturbated, it is so shameful," the petitioner wrote.She said students felt unsafe at the school. "It is unacceptable that a man trespassed and did such acts at a school where students' safety should be guaranteed, and that he felt proud of his actions and posted the clips on social media which people all over the world can access," she said.The petitioner called for a swift investigation and public attention to the situation. The petition gained more than 43,000 signatures as of Sunday afternoon.Dongduk students are angry. "Is the place where I study obscene to you? Can a women's university become a place for masturbation only because it is a place women attend? How can he compensate for the shock of students who took lectures in that classroom for about a week without knowing it? What was the security agency doing?" a student wrote on a portal site.The student council denounced the school's lax security. According to the council, police could not find surveillance camera recordings of the building on the day the man was presumed to have trespassed because cameras were installed only after the incident."We'll ask the school authorities to come up with measures on how to strengthen security and how to prevent outsiders from entering school," a member of the council said.